Uzi Tools - Free Online Calculators and Utilities
49 Free Tools Available

All Free Online Calculators & Utilities

Browse our complete collection of free online calculators and utilities. Everything runs in your browser with complete privacy.

Finance & Budgeting Tools & Calculators

Free online calculators for mortgages, investments, retirement, budgets, and more. All processing in your browser—no signup, no data stored.

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Mortgage Payment Calculator

Estimate monthly home loan payments with principal, interest, taxes, and insurance.

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Compound Interest Calculator

Project savings or investment growth with compound interest over time.

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Investment / SIP Returns Calculator

Calculate the future value of monthly investments (SIP) with expected returns.

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Retirement Savings Planner

Estimate how much you need to save to reach your retirement goal.

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Paycheck / Net Salary Calculator

Estimate take-home pay after taxes and deductions.

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Debt Payoff / Snowball Calculator

Plan how to pay off loans faster with the debt snowball or avalanche method.

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Health & Fitness Tools & Calculators

Free online health calculators: BMI, BMR, TDEE, body fat, calories, water intake, sleep cycles, ideal weight. All processing in your browser—no signup, no data stored.

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BMI Calculator

Calculate your Body Mass Index (BMI) from height and weight to assess your weight category.

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BMR / TDEE Calculator

Estimate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) to understand your daily calorie needs.

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Body Fat Percentage Calculator

Estimate your body fat percentage using the US Navy method, a simple measurement-based calculation.

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Daily Calorie Intake Calculator

Get personalized daily calorie targets for weight maintenance, loss, or gain based on your body metrics and activity.

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Water Intake Calculator

Estimate your daily hydration needs based on your weight and activity level to stay properly hydrated.

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Sleep Cycle Calculator

Find optimal bed and wake times based on 90-minute sleep cycles to wake up feeling refreshed.

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Education & Everyday Tools & Calculators

Free online tools: age on planets, days alive, clothing size conversion, grade/GPA, reading speed, tip and bill split. No signup, all in your browser.

Age on Planets / Days Alive Calculator

See your age in days and your age on Mercury, Venus, Mars, and other planets.

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Clothing Size Conversion Calculator

Convert between US, UK, and EU clothing and shoe sizes to find your perfect fit.

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Grade / GPA Calculator

Calculate your GPA from letter grades and credits, or find the grade you need for a target GPA.

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Reading / Typing Speed Calculator

Calculate your words per minute (WPM) for reading or typing, or estimate the time needed for a given text.

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Tip & Bill Split Calculator

Calculate tip percentage, total bill amount, and split the cost per person for any restaurant meal.

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Converters & Calculators Tools & Calculators

Free online converters for number bases, units, data sizes, date/time, and Roman numerals. No signup, all in your browser.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal bases quickly with this online tool.

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Universal Unit Converter

Convert length, weight, temperature, and more between metric and imperial units instantly.

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Data Size Converter

Convert digital storage sizes like bytes, KB, MB, GB, and TB with this easy-to-use tool.

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Date & Time Calculator

Calculate the exact duration between two dates or add/subtract time with this date difference calculator.

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Roman Numeral Converter

Convert standard numbers to Roman numerals and Roman numerals to numbers with this translator tool.

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Home, Auto & DIY Tools & Calculators

Free online calculators for paint coverage, concrete volume, tire sizes, auto loans, solar savings, and landscaping. No signup, all in your browser.

Paint Coverage Calculator

Estimate how much paint you need for walls, rooms, and ceilings, including for two coats.

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Concrete & Masonry Calculator

Calculate the exact volume of concrete, cubic yards, or premixed bags needed for your project.

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Tire Size Calculator

Compare tire sizes, calculate wheel diameter, and convert metric to inches to ensure proper fit.

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Car Loan vs Lease Calculator

Compare the total costs of financing a car versus leasing one to make the best auto financing decision.

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Solar Panel ROI Calculator

Estimate energy savings and payback period for a home solar installation to understand your return on investment.

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Landscape Materials Calculator

Calculate the amount of mulch, soil, or gravel needed for your garden or yard projects.

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Math & Statistics Tools & Calculators

Free online math calculators and visualizers for algebra, geometry, probability, and calculus. Graph functions, solve equations, and explore statistics with step-by-step explanations. All processing in your browser—no signup, no data stored.

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Graph Plotter

Draw 2D graphs of math functions and visualize curves on a coordinate plane.

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Quadratic Equation Solver

Solve ax² + bx + c = 0 and see real or complex roots with step-by-step breakdown.

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Linear Regression Calculator

Fit a best-fit line to (x, y) data and see slope, intercept, and correlation.

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Bayes' Theorem Calculator

Compute posterior probabilities from prior and likelihood values using Bayes' theorem.

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Permutation & Combination Calculator

Compute nPr and nCr for counting arrangements and selections in probability problems.

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Prime Factorization Calculator

Factor any positive integer into its prime factors and see the product form.

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Frequently Asked Questions